I really can't see using a full suspension bike for serious touring. Pedaling eficiency (especially up hills), weight and, if this is a long tour, moving parts to worry about repairing, are all serious issues. For a short (2-6 day) supported tour or a short tour with a trailer, it could be doable, but not the most pleasant choice.
Another factor is cost. Others may know better, but I don't know of any decent full suspension bike for under a grand, and I'd be leary about a used suspension. A good quality old school steel mountain bike, cyclocross bike or even a true tourer can be found used for a a few hundred.